var header = [ 
        ['Year', 'Sales', 'Expenses']  
    ];

var raw_data = [
    ['2004',  1000,      400],
    ['2005',  1170,      460],
    ['2006',  660,       1120],
    ['2007',  1030,      540] 
    ,['2008',  900,      480]
    ,['2009',  1070,      490]
    ,['2010',  690,       920]
    ,['2011',  990,      780]

  ];

     
